Saw a discussion on TL discussing the (rather miniscule) steppe % of the IIT JEE toppers belonging to the Reddy and Baniya groups. Keeping aside the question of whether IQ measures intelligence or something else (ref Taleb), saw another gem (SS below). This is not how IQ works.
WIll share some snippets from Robert Plomin's book 'Blueprint' in this thread.
1. Child's expected IQ is not the average IQ of the parents, rather the expected IQ of the child regresses to the population mean.
2. I have seen no evidence yet that higher AASI south Indian groups are less intelligent that low AASI higher Steppe% north indians, pakistanis, afghans, tajik etc.
1. Child's expected IQ is not the average IQ of the parents, rather the expected IQ of the child regresses to the population mean.
2. I have seen no evidence yet that higher AASI south Indian groups are less intelligent that low AASI higher Steppe% north indians, pakistanis, afghans, tajik etc.
It is true that a lot of physical and psychological trait differences between individuals of a group are heritable or genetic (ss1) , but 'heritable' has a very specific meaning (ss2). These statistics in SS1 were determined using twin-studies as they can help differentiate between hereditary and environmental factors (study designs are in the book).
Heritability is a statistic, it cannot predict the future. It is not static and changes with time. Eg. Wealthier countries have higher heritability of weight, higher educational opportunities increase heritability of scholastic achievements.
Heritability is also population specific, and it cannot predict the future trends. Eg. Many countries have had a uniform increase in mean weight which had nothing to do with heritability of weight. What genetics does affect are the individual differences in weight gain.
Heritability of a trait means it that it can explain variance within individuals of a group, it does mean that it definitely explains differences between groups. Examples below.
The Heritability numbers given above (in Plomin's book which relies mainly on twin studies) themselves are overstated as per Taleb's work.
Given all of this, to correlate IQ/intelligence in modern individuals to their ancestry components going back 2500-7000 years is a fool's errand.
Wrt the JEE toppers, while they for sure must have above average intelligence, what they achieved would not have been possible without focus, determination and hard work.
Wrt the JEE toppers, while they for sure must have above average intelligence, what they achieved would not have been possible without focus, determination and hard work.
Shitpost or not, correlating IQ, intelligence with ancestry, haplogroups etc. is a twitter genetics sub genre in itself, worth commenting upon.
correction: 'does not mean that' instead of 'does mean that'.
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